Wisconsin - Criteria: C (architecture/engineering)
| St. John's Evangelical Lutheran Church Complex |
| St. John's Lutheran Church |
| St. John's Military Academy |
| St. John's Roman Catholic Cathedral |
| St. John the Baptist Catholic Church |
| St. Josaphat Basilica |
| St. Joseph's Catholic Church Complex |
| St. Joseph's Chapel |
| St. Joseph's Roman Catholic Church |
| St. Lawrence Catholic Church |
| St. Luke's Episcopal Church, Chapel, Guildhall, and Rectory |
| St. Mark's Episcopal Church |
| St. Mark's Episcopal Church, Guild Hall and Vicarage |
| St. Martini Evangelical Lutheran Church |
| St. Mary's Catholic Church |
| St. Mary's Rectory |
| St. Mary's Roman Catholic Church |
| St. Matthew's Episcopal Church |
| St. Matthias Episcopal Church |
| Stock Pavilion |
| Stolte, William, Jr., House |
| Stolte, William, Sr., House |
| Stone, Ben and Margaret, Boathouse |
| Stonefield |
| Stoner, Joseph J., House |
| Stoughton Main Street Commercial Historic District |
| Stoughton Universalist Church |
| St. Patrick's Church |
| St. Patrick's Roman Catholic Church |
| St. Patrick's Roman Catholic Church |
| St. Patrick's Roman Catholic Church |
| St. Patrick's Roman Catholic Church |
| St. Paul Evangelical Lutheran Church |
| St. Paul's Episcopal Church |
| St. Paul's Episcopal Church |
| St. Paul's Episcopal Church |
| St. Peter's and St. Joseph's Catholic Churches |
| St. Peter's Church |
| St. Peter's Episcopal Church |
| St. Peter's Roman Catholic Church |
| Stribley, Charles W., House |
| Sturgeon Bay Bridge |
| Sturgeon Bay Canal Lighthouse |
| Sturgeon Bay Post Office |
| St. Wenceslaus Roman Catholic Church |
| Suhr, John J., House |
| Sunnyhill Home |
| Sun Prairie Water Tower |
| Sunset Hills Historic District |
| Sunset Point |
| Superior Entry South Breakwater Light |
| Sutliff, Solon and Mathilda, House |
| Swan House and Vita Spring Pavilion |
| Tainter, Louis Smith, House |
| Tainter, Mabel, Memorial Building |
| Taliesin |
| Tallman House |
| Tank Cottage |
| Taylor County Courthouse |
| Temple of Free Masonry |
| Temple Zion and School |
| Ten Chimneys |
| Ten Eyck, Albert and Minna, Round Barn |
| Tenney Building |
| Tenney Park-Yahara River Parkway |
| Tenny, Dr. J. T., House |
| Tester and Polin General Merchandise Store |
| Third Avenue Historic District |
| Third Avenue Historic District |
| Third Ward School |
| Thomas, I. C., Drug Store |
| Thomas Stone Barn |
| Thompson, Erick J., House |
| Thompson's Block |
| Thompson, Thomas Henry, House |
| Thordarson Estate Historic District |
| Timm, Herman C., House |
| Tomah Public Library |
| Town of Milwaukee Town Hall |
| Trapp Filling Station |
| Trimborn Farm |
| Trinity Espicopal Church |
| Trinity Evangelical Lutheran Church |
| Tripoli Temple |
| Trogner, George W. and Sarah, House |
| Trunck, Joseph and Augusta, Boathouse |
| Tufts, William B. and Jennie, House |
| Turck, Christian, House |
| Turner Hall |
| Turtleville Iron Bridge |
| Uihlein, Herman, House |
| Union Depot |
| Union House Hotel |
| United Laymen Bible Student Tabernacle |
| United States Post Office and Federal Courthouse |
| United Unitarian and Universalist Church |
| Unity Chapel |
| University Heights Historic District |
| University Hill Farms Historic District |
| University of Wisconsin Field House |
Data from United States Park Service and Wikidata
